How popular is Rheba?

Rheba is a somewhat popular first name for females (#4029 out of 4276, Top 94%) but a unique last name for all people. (2000 U.S. Demographics)

Rheba entered the list in 1900-1909 and reached its top position of #1299 in the U.S. in the 1920s, but is not listed at the moment. (2015 U.S. SSA Records)

Which version is better?

with its source forms and related girl names. Rebecca(#188 last year), Rivka(#876), Rebeca(#1317), Rebeka and Reba are the popular related forms of Rheba appearing in the Top 2000. These forms of Rheba were popular as baby names 45 years ago (adoption of 1.3%) and are now much less common (adoption 0.1%, 89.5% less), with versions such as Rebecca becoming somewhat outmoded. Rivka is the most fashionable girl name here.